Eficiencia de tres herbicidas post emergentes para controlar Cyperus rotundus

Abstract

Cyperus rotundus is considered one of the most aggressive and difficult-to-control species in agricultural systems due to its high capacity for reproduction through underground structures. The objective of this research was to evaluate the effectiveness of three post-emergent herbicides in controlling Cyperus rotundus and to conduct an analysis of the variable costs associated with each treatment under study. A randomized block design was used in this study, consisting of four treatments: T1 (Control), T2 (Bispyribac sodium), T3 (Metsulfuron- methyl), and T4 (Mesotrione + Nicosulfuron). The herbicides were applied using the recommended commercial doses for each product. Monitoring was conducted over a 90-day period, with data recorded twice per week, using the following variables: number of live leaves, number of dead leaves, total number of leaves, number of shoots, number of bulbs, and plant height. Data analysis showed a lack of normality in the recorded data, and the Kruskal-Wallis test confirmed significant differences among the treatments (p < 0.05). Treatment T3 (Metsulfuron-methyl) achieved a 100% mortality rate of the weed under study, unlike treatments T2 and T4, which reached mortality rates of 2% and 30% respectively. Based on the Perrin method, the cost per hectare of applying treatment T3 was efficient at $4.26, making it a technically and financially viable alternative for managing this species.